It was sitting in a small puddle in the middle of the track we were followed next to a creek in the rain forest. I had to look twice - a crayfish? in the middle of a forest? and bright blue?? The cray started to slowly back away. We did the same. Later, we found some information about the creature - it was a Lamington Spiny Cray, and it commonly moves from one creek to another. There are nine species of the Spiny Cray in the National Park, varying in colour from bright blue to a distinctive red. Weird.